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| Tetraneuris acaulis var. acaulis (Pursh) Greene | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||
| Family: | Asteraceae or Compositae | ||||||||
| Genus: | Tetraneuris acaulis var. acaulis | ||||||||
| Species Synonyms: | Actinea acaulis (Pursh) Spreng. Actinella acaulis (Pursh) Parker Hymenoxys acaulis (Pursh) Parker Tetraneuris simplex A. Nels. |
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| Common Names: | stemless bitterweed stemless four-nerve daisy stemless hymenoxys rubberweed |
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| DISTRIBUTION | |||||||||
| Canada: | southern Alberta – southwestern Saskatchewan | ||||||||
| Saskatchewan: | southwestern Saskatchewan; Cypress Hills – Matador | ||||||||
| Ecoregion: | Cypress Upland, Mixed Grassland | ||||||||
| HABITAT | |||||||||
| Saskatchewan: | dry grassland hillsides | ||||||||
| Associated Species: | tufted fleabane | ||||||||
| RARITY STATUS | |||||||||
| Provincial
Status According to Harms (2003): |
Endangered |
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| Nature Conservancy Status: | G5 S1 |
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| Saskatchewan
Species at Risk Status: |
None |
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| COSEWIC Status: | None |
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| Stemless bitterweed is endangered because it is regionally restricted in the province and population sizes vary from large to small. Possible threats include occurrences in heavily populated areas, fragile habitats, or planned developments. | |||||||||
| SPECIES DESCRIPTION | |||||||||
| Height: | 10 – 30 cm | ||||||||
| Roots: | taproot woody | ||||||||
| Stems: | stem base thick, branched, woody, persistent leaf bases with woolly axils; stems unbranched | ||||||||
| Leaves: | basal, tufted, 2 – 8 cm long, 2 – 3 mm wide, linear oblong to narrowly inversely lance-shaped, tip acute, light green, silky-hairy, often silvery | ||||||||
| Inflorescence: | heads solitary; bracts in 1 – 2 subequal series, 5 – 8 mm high, brownish with dark tips, silky-hairy | ||||||||
| Flowers: | ray flowers 10 – 15, reflexed at maturity, 6 – 15 mm long, to 0.5 cm wide, 3-toothed, female, fertile, yellow with orange nerves; disc flowers many, perfect, fertile, yellow | ||||||||
| Fruits: | achenes weakly 4-angled, coarsely hairy with appressed hairs; pappus 5 – 7 scales | ||||||||
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